Drill the holes

Use a dremel and a tiny bit (#60 or #66) to drill a hole on every circle on the soldering side. www.mouser.com sells the bits, part number 5876-409-66

Make sure to drill 8 or 14 holes for each IC

Periodically check the opposite side to make sure you’re still lined up (hold the drill vertical, not at a slant)

Depending on the IC sockets you have, you may need to ream out the holes for the IC sockets using a thumbtack or a larger drill bit. If your board is too thick (e.g. masonite), you may need to counter-sink the IC socket holes